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steamhead: help with Megasteam Sizing...

jpf321
jpf321 Member Posts: 1,567
OK since I'm no longer concerned much with a gas conversion, I'm looking strongly at the Burnham Megasteam .. however, I need a bit of help with sizing ..



I currenlty have 384sq ft of EDR, mains are fully insulated with 1" and PVC jackets/inserts on the fittings.



I have 2 mains, each 2" which branch from boiler and join together at the far end to a wet return making a big loop .. 1 main is [email protected]" the other is [email protected]" .. therefore, I don't think I need to worry much about extra P/U factor.



I would like to use the boiler to make DHW .. whether it be by indirect or by tankless coil .. however, I've heard that a tankless coil could really collapse my steam in the boiler ..



I have an empty Electric HW heater/tank next to the boiler currently and would like to use that if I can as an indirect (although I'm not exactly sure how.. but that's for another discussion) ..



So the crux of my problem .. the Megasteam comes in either a 396sq ft or the next size up is 513sq ft .. the 513 seems quite a bit bigger than I need .. and the 396 seems just border line.



And then how best to make my DHW using the boiler... Tankless Coil or Indirect? and does a Tankless Coil significantly affect steam production?



thanks!
1-pipe Homeowner - Queens, NYC

NEW: SlantFin Intrepid TR-30 + Tankless + Riello 40-F5 @ 0.85gph | OLD: Fitzgibbons 402 boiler + Beckett "SR" Oil Gun @ 1.75gph

installed: 0-20oz/si gauge | vaporstat | hour-meter | gortons on all rads | 1pc G#2 + 1pc G#1 on each of 2 mains

Connected EDR load: 371 sf venting load: 2.95cfm vent capacity: 4.62cfm
my NEW system pics | my OLD system pics

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